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Finding the Fourth Proportional to 388.66, 587.40 and 381.94

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Solution

The fourth proportional to 388.66, 587.40 and 381.94 is: 577.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.66 : 587.40 = 381.94 : x
  2. Step 2: Convert to fraction form
    388.66/587.40 = 381.94/x
  3. Step 3: Cross multiply
    388.66x = 587.40 × 381.94
  4. Step 4: Simplify right side
    388.66x = 224,351.56
  5. Step 5: Solve for x
    x = 224,351.56/388.66
  6. Step 6: Final answer
    x = 577.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.